0,0 → 1,90 |
/* |
* Copyright (C) 2003 Josef Cejka |
* Copyright (C) 2005 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
#include <console/console.h> |
#include <console/chardev.h> |
#include <synch/waitq.h> |
#include <synch/spinlock.h> |
#include <arch/types.h> |
#include <typedefs.h> |
#include <arch.h> |
|
/** Standard input character device. */ |
chardev_t *stdin = NULL; |
|
/** Get string from character device. |
* |
* Read characters from character device until first occurrence |
* of newline character. |
* |
* @param chardev Character device. |
* @param buf Buffer where to store string terminated by '\0'. |
* @param len Size of the buffer. |
* |
* @return Number of characters read. |
*/ |
count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
{ |
index_t index = 0; |
char ch; |
|
while (index < buflen) { |
ch = getc(chardev); |
if (ch == '\n') { /* end of string => write 0, return */ |
buf[index] = '\0'; |
return (count_t) index; |
} |
buf[index++] = ch; |
} |
return (count_t) index; |
} |
|
/** Get character from character device. |
* |
* @param chardev Character device. |
* |
* @return Character read. |
*/ |
__u8 getc(chardev_t *chardev) |
{ |
__u8 ch; |
ipl_t ipl; |
|
waitq_sleep(&chardev->wq); |
ipl = interrupts_disable(); |
spinlock_lock(&chardev->lock); |
ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
chardev->counter--; |
spinlock_unlock(&chardev->lock); |
interrupts_restore(ipl); |
|
chardev->op->resume(); |
|
return ch; |
} |